QueryParser (Lucene 8.9.0 API)乐学网一站式学习平台

java.lang.Object
- org.apache.lucene.util.QueryBuilder
- - org.apache.lucene.queryparser.classic.QueryParserBase
  - - org.apache.lucene.queryparser.classic.QueryParser

All Implemented Interfaces:

QueryParserConstants, CommonQueryParserConfiguration

Direct Known Subclasses:

ComplexPhraseQueryParser, ExtendableQueryParser, MultiFieldQueryParser
```
public class QueryParser
extends QueryParserBase
implements QueryParserConstants
```
This class is generated by JavaCC. The most important method is QueryParserBase.parse(String). The syntax for query strings is as follows: A Query is a series of clauses. A clause may be prefixed by:
- a plus (+) or a minus (-) sign, indicating that the clause is required or prohibited respectively; or
- a term followed by a colon, indicating the field to be searched. This enables one to construct queries which search multiple fields.
A clause may be either:
- a term, indicating all the documents that contain this term; or
- a nested query, enclosed in parentheses. Note that this may be used with a +/- prefix to require any of a set of terms.
Thus, in BNF, the query grammar is:
```
   Query  ::= ( Clause )*
   Clause ::= ["+", "-"] [<TERM> ":"] ( <TERM> | "(" Query ")" )
 
```
Examples of appropriately formatted queries can be found in the query syntax documentation.

In TermRangeQuerys, QueryParser tries to detect date values, e.g. date:[6/1/2005 TO 6/4/2005] produces a range query that searches for "date" fields between 2005-06-01 and 2005-06-04. Note that the format of the accepted input depends on the locale. A DateTools.Resolution has to be set, if you want to use DateTools for date conversion.

The date resolution that shall be used for RangeQueries can be set using QueryParserBase.setDateResolution(DateTools.Resolution) or QueryParserBase.setDateResolution(String, DateTools.Resolution). The former sets the default date resolution for all fields, whereas the latter can be used to set field specific date resolutions. Field specific date resolutions take, if set, precedence over the default date resolution.

If you don't use DateTools in your index, you can create your own query parser that inherits QueryParser and overwrites QueryParserBase.getRangeQuery(String, String, String, boolean, boolean) to use a different method for date conversion.

Note that QueryParser is not thread-safe.

NOTE: there is a new QueryParser in contrib, which matches the same syntax as this class, but is more modular, enabling substantial customization to how a query is created.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class QueryParser.Operator
The default operator for parsing queries.
- Nested classes/interfaces inherited from class org.apache.lucene.util.QueryBuilder
  QueryBuilder.TermAndBoost

Nested Classes
Modifier and Type	Class and Description
`static class`	`QueryParser.Operator` The default operator for parsing queries.

Field Summary

Fields
Modifier and Type	Field and Description
`static boolean`	`DEFAULT_SPLIT_ON_WHITESPACE` default split on whitespace behavior
`Token`	`jj_nt` Next token.
`Token`	`token` Current token.
`QueryParserTokenManager`	`token_source` Generated Token Manager.

Fields inherited from class org.apache.lucene.queryparser.classic.QueryParserBase
AND_OPERATOR, field, OR_OPERATOR

Fields inherited from class org.apache.lucene.util.QueryBuilder
analyzer, autoGenerateMultiTermSynonymsPhraseQuery, enableGraphQueries, enablePositionIncrements

Fields inherited from interface org.apache.lucene.queryparser.classic.QueryParserConstants
_ESCAPED_CHAR, _NUM_CHAR, _QUOTED_CHAR, _TERM_CHAR, _TERM_START_CHAR, _WHITESPACE, AND, BAREOPER, Boost, CARAT, COLON, DEFAULT, EOF, FUZZY_SLOP, LPAREN, MINUS, NOT, NUMBER, OR, PLUS, PREFIXTERM, QUOTED, Range, RANGE_GOOP, RANGE_QUOTED, RANGE_TO, RANGEEX_END, RANGEEX_START, RANGEIN_END, RANGEIN_START, REGEXPTERM, RPAREN, STAR, TERM, tokenImage, WILDTERM

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`QueryParser(CharStream stream)` Constructor with user supplied CharStream.
`protected`	`QueryParser(QueryParserTokenManager tm)` Constructor with generated Token Manager.
	`QueryParser(String f, Analyzer a)` Create a query parser.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Query`	`Clause(String field)`
`int`	`Conjunction()`
`void`	`disable_tracing()` Disable tracing.
`void`	`enable_tracing()` Enable tracing.
`ParseException`	`generateParseException()` Generate ParseException.
`Token`	`getNextToken()` Get the next Token.
`boolean`	`getSplitOnWhitespace()`
`Token`	`getToken(int index)` Get the specific Token.
`int`	`Modifiers()`
`Query`	`MultiTerm(String field, List<BooleanClause> clauses)` Returns the first query if splitOnWhitespace=true or otherwise the entire produced query
`Query`	`Query(String field)`
`void`	`ReInit(CharStream stream)` Reinitialise.
`void`	`ReInit(QueryParserTokenManager tm)` Reinitialise.
`void`	`setAutoGeneratePhraseQueries(boolean value)` Set to true if phrase queries will be automatically generated when the analyzer returns more than one term from whitespace delimited text.
`void`	`setSplitOnWhitespace(boolean splitOnWhitespace)` Whether query text should be split on whitespace prior to analysis.
`Query`	`Term(String field)`
`Query`	`TopLevelQuery(String field)`

Methods inherited from class org.apache.lucene.queryparser.classic.QueryParserBase
addClause, addMultiTermClauses, escape, getAllowLeadingWildcard, getAutoGeneratePhraseQueries, getBooleanQuery, getDateResolution, getDefaultOperator, getField, getFieldQuery, getFieldQuery, getFuzzyMinSim, getFuzzyPrefixLength, getFuzzyQuery, getLocale, getMaxDeterminizedStates, getMultiTermRewriteMethod, getPhraseSlop, getPrefixQuery, getRangeQuery, getRegexpQuery, getTimeZone, getWildcardQuery, init, newBooleanClause, newFieldQuery, newFuzzyQuery, newMatchAllDocsQuery, newPrefixQuery, newRangeQuery, newRegexpQuery, newWildcardQuery, parse, setAllowLeadingWildcard, setDateResolution, setDateResolution, setDefaultOperator, setFuzzyMinSim, setFuzzyPrefixLength, setLocale, setMaxDeterminizedStates, setMultiTermRewriteMethod, setPhraseSlop, setTimeZone

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.lucene.queryparser.flexible.standard.CommonQueryParserConfiguration
getAnalyzer, getEnablePositionIncrements, setEnablePositionIncrements

- Field Detail
  - DEFAULT_SPLIT_ON_WHITESPACE
```
public static final boolean DEFAULT_SPLIT_ON_WHITESPACE
```
    default split on whitespace behavior
    
    See Also:
    
    Constant Field Values
  - token_source
```
public QueryParserTokenManager token_source
```
    Generated Token Manager.
  - token
```
public Token token
```
    Current token.
  - jj_nt
```
public Token jj_nt
```
    Next token.
- Constructor Detail
  - QueryParser
```
public QueryParser(String f,
                   Analyzer a)
```
    Create a query parser.
    
    Parameters:
    
    f - the default field for query terms.
    
    a - used to find terms in the query text.
  - QueryParser
```
protected QueryParser(CharStream stream)
```
    Constructor with user supplied CharStream.
  - QueryParser
```
protected QueryParser(QueryParserTokenManager tm)
```
    Constructor with generated Token Manager.
- Method Detail
  - setAutoGeneratePhraseQueries
```
public void setAutoGeneratePhraseQueries(boolean value)
```
    Set to true if phrase queries will be automatically generated when the analyzer returns more than one term from whitespace delimited text. NOTE: this behavior may not be suitable for all languages.
    Set to false if phrase queries should only be generated when surrounded by double quotes.
    The combination splitOnWhitespace=false and autoGeneratePhraseQueries=true is disallowed. See LUCENE-7533.
    
    Overrides:
    
    setAutoGeneratePhraseQueries in class QueryParserBase
  - getSplitOnWhitespace
```
public boolean getSplitOnWhitespace()
```
    See Also:
    
    setSplitOnWhitespace(boolean)
  - setSplitOnWhitespace
```
public void setSplitOnWhitespace(boolean splitOnWhitespace)
```
    Whether query text should be split on whitespace prior to analysis. Default is false.
    The combination splitOnWhitespace=false and autoGeneratePhraseQueries=true is disallowed. See LUCENE-7533.
  - Conjunction
```
public final int Conjunction()
                      throws ParseException
```
    Throws:
    
    ParseException
  - Modifiers
```
public final int Modifiers()
                    throws ParseException
```
    Throws:
    
    ParseException
  - TopLevelQuery
```
public final Query TopLevelQuery(String field)
                          throws ParseException
```
    Specified by:
    
    TopLevelQuery in class QueryParserBase
    
    Throws:
    
    ParseException
  - Query
```
public final Query Query(String field)
                  throws ParseException
```
    Throws:
    
    ParseException
  - Clause
```
public final Query Clause(String field)
                   throws ParseException
```
    Throws:
    
    ParseException
  - Term
```
public final Query Term(String field)
                 throws ParseException
```
    Throws:
    
    ParseException
  - MultiTerm
```
public final Query MultiTerm(String field,
                             List<BooleanClause> clauses)
                      throws ParseException
```
    Returns the first query if splitOnWhitespace=true or otherwise the entire produced query
    
    Throws:
    
    ParseException
  - ReInit
```
public void ReInit(CharStream stream)
```
    Reinitialise.
    
    Specified by:
    
    ReInit in class QueryParserBase
  - ReInit
```
public void ReInit(QueryParserTokenManager tm)
```
    Reinitialise.
  - getNextToken
```
public final Token getNextToken()
```
    Get the next Token.
  - getToken
```
public final Token getToken(int index)
```
    Get the specific Token.
  - generateParseException
```
public ParseException generateParseException()
```
    Generate ParseException.
  - enable_tracing
```
public final void enable_tracing()
```
    Enable tracing.
  - disable_tracing
```
public final void disable_tracing()
```
    Disable tracing.

Class QueryParser

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.QueryBuilder

Field Summary

Fields inherited from class org.apache.lucene.queryparser.classic.QueryParserBase

Fields inherited from class org.apache.lucene.util.QueryBuilder

Fields inherited from interface org.apache.lucene.queryparser.classic.QueryParserConstants

Constructor Summary

Method Summary

Methods inherited from class org.apache.lucene.queryparser.classic.QueryParserBase

Methods inherited from class org.apache.lucene.util.QueryBuilder

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.lucene.queryparser.flexible.standard.CommonQueryParserConfiguration

Field Detail

DEFAULT_SPLIT_ON_WHITESPACE

token_source

token

jj_nt

Constructor Detail

QueryParser

QueryParser

QueryParser

Method Detail

setAutoGeneratePhraseQueries

getSplitOnWhitespace

setSplitOnWhitespace

Conjunction

Modifiers

TopLevelQuery

Query

Clause

Term

MultiTerm

ReInit

ReInit

getNextToken

getToken

generateParseException

enable_tracing

disable_tracing